iran's president often challenges and chastises western nations in defense of his country's nuclear program. but ahmadinejad's critics argue he's trying to build a bomb by allowing scientists to enrich uranium. but he says he's willing to put a stop to the practice provided other countries fill in the gap. >> reporter: ahmadinejad spoke to nhk in new york where he's scheduled to attend the annual meeting of the u.n. general assembly. he sought to dispel international concern over the possible closure of the strait of hormuz. the main shipping route for middle east oil. >> translator: iran has been maintaining the stability of the strait. we will never pose a threat in its waters. >> reporter: western nations have been demanding iran halt its nuclear project. iran had responded by warning it might close in the persian gulf. about 90% of japan's crude oil imports comes through the narrow channel. iran held a large rally last week. in a speech, ahmadinejad said iran would press ahead with its nuclear program. but the president has to consider the increasingly harsh domestic economy. western na